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Division of Animal Nutrition, University of Illinois, Urbana
Studies of the nature of the hemorrhagic syndrome observed in weanling male rats fed irradiated beef indicated that the syndrome was caused by a lack of vitamin K and not by any hypoprothrombinemic factor in irradiated beef. This conclusion was based on the observations that: (1) when the level of irradiated beef in the diet was increased, the incidence and severity of hemorrhages decreased; and (2) the vitamin K requirement of coprophagy-prevented rats fed a diet high in irradiated beef was found to be the same as that reported for similar rats fed a purified diet.
Manuscript received 2 January 1960.